This article explains the basic concepts of linear regulators and switching mode power supplies (SMPS). It is aimed at system engineers who may not be very familiar with power supply designs and selection.
The basic operating principles of linear regulators and SMPS are explained along with a review of the advantages and disadvantages of each solution in this application note from Analog Devices. The buck step-down converter is used as an example to further explain the design considerations of a switching regulator.